docs: def post_migrate(cls, sender=None, **kwargs):
          """
          Iterate over fake_proxy_models and add contenttypes and permissions for missing proxy
          models, if this has not been done by Django yet
          """
          ContentType = apps.get_model('contenttypes', 'ContentType')
  
          for model_name, proxy_model in sender.get_proxy_models().items():
              ctype, created = ContentType.objects.get_or_create(app_label=sender.label, model=model_name)
              if created:
                  sender.grant_permissions(proxy_model)